Improved Electron-Nuclear Quantum Gates for Spin Sensing and Control

Abstract

The ability to sense and control nuclear spins near solid-state defects might enable a range of quantum technologies. Dynamically Decoupled Radio-Frequency (DDRF) control offers a high degree of design flexibility and long electron-spin coherence times. However, previous studies considered simplified models and little is known about optimal gate design and fundamental limits. Here, we develop a generalised DDRF framework that has important implications for spin sensing and control. Our analytical model, which we corroborate by experiments on a single NV center in diamond, reveals the mechanisms that govern the selectivity of gates and their effective Rabi frequencies, and enables flexible detuned gate designs. We apply these insights to numerically show a 60x sensitivity enhancement for detecting weakly coupled spins and study the optimisation of quantum gates in multi-qubit registers. These results advance the understanding for a broad class of gates and provide a toolbox for application-specific design, enabling improved quantum control and sensing.

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Cited by in corpus (4)

• Control of solid-state nuclear spin qubits using an electron spin-1/2
• Quantifying electron-nuclear spin entanglement dynamics in central-spin systems using one-tangles
• Suppression of coherent errors during entangling operations in NV centers in diamond
• Formal Integration of Electron Scattering Processes via Separation of Dynamical and Geometric Contributions